I seem to recall that the THETA needs 1.5amp for reliable charging. Depending the the USB port type (2.0, 3.0, 3.1), the power could be as low as 0.5amp. It's possible that the charging current was right on the borderline before and no longer works. What is your battery pack output rated at?

I can't address why it worked before but doesn't work now, but I'll confirm what @codetricity is saying, I always have to use a wall plug to charge my RICOH THETA S. Plugging into the USB ports on my MacBook Air (early 2015, USB 3.0 but it appears that it only supplies 1.0amp) does not work for charging.

I think its battery is damage and discharge automatically. My laptop also shows the problem like this. I change my laptop's charging jack and change its battery and its work fine.Best Laptop Repairing Course in Delhi.